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RQWILDMA'N. BOILER.' v No. 528,352. Patented ont. 3o, 1894.

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l BOILBR. No. 528,352. Patented oct. 13o, 1894.

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` UNITED STATES PATENT FFICE.

ROBERT WILDMAN, OF BAY CITY, MICHIGAN, ASSIGN OR OF ONE-HALF TO HENRY S. JOHNSON, OF SAME PLACE.

BYoILER.

SPECIFICATION forming part Aof Letters Patent No'. 528,352, dated October 80,1894.`

Application tiled Tune 29, 1894-..

To all whom it may concern.-

Beit known that I,` ROBERT WILDMAN, a citizen of the United States, residing at Bay City, in the county of Bay and State of Michigan, have invented certain new and useful Improvements in Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.v

The invention consists in the peculiar construction of a water tube boiler comprising an inner and an outer shell concentrically arranged, forming between them a water jacket or chamber, the inner shell being shorter than the outer shell, whereby water chambers are formed at the ends of the shell, tubes connecting these end chambers and water legs depending from this water chamber forming a combustion chamber at one end which communicates with the interior of the inner shell.

The invention further consists in the peculiar construction, arrangement and combination of the various parts.

In the drawings, Figure 1 is a vertical, central, longitudinal section through my improved boiler without the setting or brick work. Fig. 2 is a sectional elevation thereof centrally through the steam dome. Fig. 3 is' a central, sectional elevation showing the brick work, and a modilied form of steam dome. Fig. 4. is a cross section on line y y Fig. 3; Fig. 5 is a detail section illustrating' the construction of the boiler front.

A is a cylindrical casing forming the inner shell, and B is a shell of larger diameter and of greater length than the shell A, inclosing the same to form an annular water chamber C around the same and the water chambers D D at the ends thereof. These end water chambers are connected through the inner shell by means of the tubes E which are secured at their ends in the heads F of the inner shell. The heads of the outer shell are formed of the section G of sheet metal apertured opposite the heads of the inner shell. Upon the inner edge of this aperture is secured the wrought iron ring H, extending outwardly from the face of the section G. This ring is provided on .its exterior face witha Serial No. 516,115. (No model.)

E and secured at their ends to the heads I of the outer casing or shell. The inner shell near the forward end on the under side is cut away and around this cut away portion at the rear is the water leg L. At the sides, the water legs M are formed by al continuation of the outer casing and the plate N riveted at its upper end to the outer side of the inner shell and at its lower end to the outer casing, as plainly shown at the right hand in Fig. 2. The two heads at the front are extended downward to form the water leg O, thus entirely inclosing the fire chamber by the water legs. P are grates supported .on lugs P on the end water legs of the fire chamber.

Q -is a flue which extends through the water chamber between the two shells at the top and the rear thereof, as shown in Fig. 1, and communicates at its outer end into a smoke chamber R formed Within the brick setting S. This smoke chamber connects into the dues T arranged'between the brick casing and the outer shell of the boiler, which lues at their forward end connect into the smoke stack U.

The steam dome may be of the construction shown in Fig. 1 or Fig. 3. The fire being lighted on the gratos, the products of combustion will pass up into the inner shell around the tubes the entire length of the tubes out through the Iiue Q into the smoke chamber and thence down around the outside of the outer casing the entire length of the boiler and inallyout through the smoke stack.

The advantage of this construction is that at no point in the boiler is there any steam space in the tubes subjected to the tire which is not protected by water, so that the danger of burning out is very greatly lessened.

I preferably enlarge the forward section of the outer casing, as shown at V, Fig. 1, to form in the upper portion of that section, the steam chamber W, so that plenty of steam ameter and length than the outer shell and arranged within the same to form a water jacket between, of tubes connecting the heads of the inner shell, a combustion chamber located beneath the front ends of the tubes, an outerI casing surrounding the shells, a smoke chamber R located above the rear ends of the shells, a fiue Q located at the rear end ot' the water jacket and extending into the smoke chamber, a smoke opening at the front of the outer casing, and ues on the outside of the shells connecting the smoke chamber and opening, substantially as described.

2. The combination of an outer shell and an inner shell of lesser diameter and length than the outer shell and arranged within the same to form a-water jacket between tubes connecting the heads of the inner shell, a tire chamber at the forward end, depending Water legs from the water chamber around the tire chamber, an outer casing surrounding the shells a flue through the water chamber at the rear end of the inner shell, return iues located between the outer shell and casing and a smoke stack at the forward end with which said return flues communicate, substantially as described.

3. In a steam generator, the combination with the shell having centrally apertured heads, of rings II surrounding the apertures and secured to the head, an annular groove in the outer faces of the rings, packing rings within the grooves, plates I detachably secured to the rings, tubes secured within the shell, and rods K passing through the tubes and secured to the plates I, substantially as described.

4. In a steam generator of the kind described, the combination of the inner and outer shells arranged substantially as set forth, the inner shell having a cut away portion on its under forward face, the re chamber beneath such cut-away portion, the front and rear waterlegs L at front and rear of said fire chamber and the side water legs M form ed by an extension of the outer easing and the wall N secured at its upper end to the side of the inner shell and at its lower end to the extension, the tubes E connecting the heads of the inner shell and a flue Q through the Water chamber at the rear end of theinner shell, substantially as described.

In testimony whereof I afx my signature in presence of two witnesses.

' ROBERT IVILDM AN.

Witnesses:

M. B. ODOGHERTY, L. J. WHrr'rEMoRE. 

